fix syntax of template

slapos/recipe/apache/template/varnish.vcl.in

@@ -5,8 +5,8 @@
 # server.
 # 
 backend default {
-    .host = "${:backend_host}";
-    .port = "${:backend_port}";
+    .host = "%(backend_host)s";
+    .port = "%(backend_port)s";
     .probe = { 
         .url = "/";
         .timeout = 10s;

slapos/recipe/apache/template/varnishd.in

 #!/bin/sh
-exec %(varnishd_binary)s -F -n $(directory)s -P $(pid)s -f $(configuration_file) -a %(port)s -T %(control_port) -s $(storage)s
+exec %(varnishd_binary)s -F -n %(directory)s -P %(pid)s -f %(configuration_file)s -a %(port)s -T %(control_port)s -s %(storage)s